s1_goto_dir(){
	cd "$1" || exit 1
}
s2_touch_empty_file_with_given_name(){
	touch "$1"
}
s3_make_directories(){
	mkdir -p projects/git projects/backup
}
s4_create_6_files(){
       	touch projects/linux1_{centos,redhat,c_programming} projects/linux2_{centos,redhat,c_programming}
}
s5_make_directories_in_git(){
	mkdir -p projects/git/linux1 projects/git/linux2
}
s6_move_files_to_dir_1_or_2(){
	mv projects/linux1_*projects/git/linux1/
	mv projects/linux2_*projects/git/linux2/
}
s7_create_package_and_compress(){
	tar -czvf projects/backup/git.tar.gz -C projects git
}
s8_delete_dir_git(){
	rm -f projects/git
}
s9_recover_from_git_tar_gz_backup(){
	tar -zxvf projects/backup/git.tar.gz -C projects
}
s10_create_package_and_compress(){
	tar -jcvf projects/backup/git.tar.bz2 -C projects git
}
s11_find_and_sort_alphabetically_all_created_files_and_dirs(){
	find ./projects | sort
}
s12_get_next_15_minutes_boundary(){
	current_minute=$(date +M)
	next_multiple=$(( ( (current_minute + 14)/15)*15))
	if [ $next_multiple -eq 60]; then
		date -d"$next_multiple minutes" +%Y-%m-%d_%H:00:00
	else
		date -d"$next_multiple minutes" +%Y-%m-%d_%H:%M:00
	fi
}
